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<meta name="description" content="优化dns查询尽量把资源都放在一个网站，如css、js，尽量减少域名，这样就可以减少dns查询 优化TCP连接开启连接复用，在请求头里写keep-alive使用HTTP/2.0的多路复用 发送HTTP请求不滥用cookie，尽量减小cookie体积使用cache-control（缓存），一段时间内不发送请求，用缓存文件同时发送多个请求，如css和js，会同时下载提高效率，但和减少dns查询起冲突，">
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        <h3 id="优化dns查询"><a href="#优化dns查询" class="headerlink" title="优化dns查询"></a>优化dns查询</h3><p>尽量把资源都放在一个网站，如css、js，尽量减少域名，这样就可以减少dns查询</p>
<h3 id="优化TCP连接"><a href="#优化TCP连接" class="headerlink" title="优化TCP连接"></a>优化TCP连接</h3><p>开启连接复用，在请求头里写keep-alive<br>使用HTTP/2.0的多路复用</p>
<h3 id="发送HTTP请求"><a href="#发送HTTP请求" class="headerlink" title="发送HTTP请求"></a>发送HTTP请求</h3><p>不滥用cookie，尽量减小cookie体积<br>使用cache-control（缓存），一段时间内不发送请求，用缓存文件<br>同时发送多个请求，如css和js，会同时下载提高效率，但和减少dns查询起冲突，所以文件少的时候，可以把所有资源放一个域名里，减少dns查询，但当文件多的时候可以把每8个文件放同一个域名里，这样8个文件以同时请求，减少了请求时间，</p>
<h3 id="接收响应"><a href="#接收响应" class="headerlink" title="接收响应"></a>接收响应</h3><p>ETag<br>服务器检查网页有无更新(md5)，没有更新的话就返回304<br>GZip<br>用GZip把css、js压缩，再发送</p>
<h3 id="优化js和css"><a href="#优化js和css" class="headerlink" title="优化js和css"></a>优化js和css</h3><p>不要把js、css写在html里，这样js、css文件就可以缓存<br>合并文件，把多个js合并成一个，减少请求数<br>把js和css文件都放在cdn，因为距离很远的请求费时很长，把文件放在cdn可解决距离的问题，还可以增加并发下载数<br>把css放在head里，js放在body最后，因为css不管放在哪都会阻塞html渲染，所以放在前面先下载，js放后面可以让html先显示，并且可以直接获取到节点（因为html已经加载完了）</p>
<h3 id="延时加载（加薪）"><a href="#延时加载（加薪）" class="headerlink" title="延时加载（加薪）"></a>延时加载（加薪）</h3><p>首先只加载第一屏的内容，让用户可以很快看到第一屏，过20ms或者等用户往下滑再加载下面的内容<br>加个loading动画</p>
<h3 id="预加载"><a href="#预加载" class="headerlink" title="预加载"></a>预加载</h3><h3 id="如何测试一个网站"><a href="#如何测试一个网站" class="headerlink" title="如何测试一个网站"></a>如何测试一个网站</h3><p>打开网站，打开控制台的Audits选项</p>
<p><a href="https://github.com/creeperyang/blog/issues/1" target="_blank" rel="noopener">更多性能优化查看</a></p>

      
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              <div class="post-toc-content"><ol class="nav"><li class="nav-item nav-level-3"><a class="nav-link" href="#优化dns查询"><span class="nav-number">1.</span> <span class="nav-text">优化dns查询</span></a></li><li class="nav-item nav-level-3"><a class="nav-link" href="#优化TCP连接"><span class="nav-number">2.</span> <span class="nav-text">优化TCP连接</span></a></li><li class="nav-item nav-level-3"><a class="nav-link" href="#发送HTTP请求"><span class="nav-number">3.</span> <span class="nav-text">发送HTTP请求</span></a></li><li class="nav-item nav-level-3"><a class="nav-link" href="#接收响应"><span class="nav-number">4.</span> <span class="nav-text">接收响应</span></a></li><li class="nav-item nav-level-3"><a class="nav-link" href="#优化js和css"><span class="nav-number">5.</span> <span class="nav-text">优化js和css</span></a></li><li class="nav-item nav-level-3"><a class="nav-link" href="#延时加载（加薪）"><span class="nav-number">6.</span> <span class="nav-text">延时加载（加薪）</span></a></li><li class="nav-item nav-level-3"><a class="nav-link" href="#预加载"><span class="nav-number">7.</span> <span class="nav-text">预加载</span></a></li><li class="nav-item nav-level-3"><a class="nav-link" href="#如何测试一个网站"><span class="nav-number">8.</span> <span class="nav-text">如何测试一个网站</span></a></li></ol></div>
            

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